Thanks for the helpful input! Typically I was running the cart a'fore the horse :/ I looked into
city regs on tree removal, and they're pretty strict. Looks like 2 tree limit, and strings (and fees) attached per each, even then. So I'm going to apply for permits and see what I can get approved. But, meanwhile, I'm going ahead with the with the hugelkultur/swails
project to capture winter runoff.
Jack Spirko goes into some detail on this very subject
http://www.thesurvivalpodcast.com/1074-contour-gardens-with-wood-core.
In any case, looks like I'll be cultivating more shade tolerant varieties than I planned for; oh well. play the hand you're dealt, and all that.
Cheers